What is the SI subunit of measure for absorbed dose?

What is the SI subunit of measure for absorbed dose?

• A. Gray (Gy)
• B. Nanogray (nGy)
• C. Microgray (µGy)
• D. Milligray (mGy)

Answer: (D)

Absorbed dose tells us how much energy from ionizing radiation is deposited in a mass, per unit of mass. The SI unit for this is the gray (Gy), defined as 1 joule per kilogram. In everyday radiography, we usually report doses using a submultiple of the gray, with milligray (mGy) being the common one—1 mGy is 0.001 Gy. Smaller submultiples like microgray or nanogray exist, but many radiographic doses are expressed in the mGy range, making milligray the practical subunit to use. So the foundational unit is the gray, and the practical subunit used most often to express absorbed dose in radiography is milligray.

Absorbed dose tells us how much energy from ionizing radiation is deposited in a mass, per unit of mass. The SI unit for this is the gray (Gy), defined as 1 joule per kilogram. In everyday radiography, we usually report doses using a submultiple of the gray, with milligray (mGy) being the common one—1 mGy is 0.001 Gy. Smaller submultiples like microgray or nanogray exist, but many radiographic doses are expressed in the mGy range, making milligray the practical subunit to use. So the foundational unit is the gray, and the practical subunit used most often to express absorbed dose in radiography is milligray.